Roberts, PhilPhil Roberts joined Megisto Systems in March, 2001, as Director of Network Architecture. He is the cochair of the Mobile IP Working Group in the IETF. Previously he spent over 7 years at Motorola working in the GSM, Multimedia, and 4th Generation Wireless Development efforts. Most recently he was the manager of the Internet Networks and Advanced Technology Group. Prior to joining Motorola he worked at AT&T Bell Labs for 8 years working on fast packet switching, 5ESS development, and system and network architecture for video-on-demand systems.